DEBT - Summary of Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Disclosure [Abstract]
Contractual interest	$ 28,765	$ 29,076	$ 57,482	$ 58,038
Amortization of deferred financing costs and debt discount	1,996	1,997	3,993	4,012
Debt extinguishment and other costs	405	1,477	806	2,197
Interest Income	(1,400)	(125)	(2,911)	(182)
Total	29,766	32,425	59,370	64,065
Interest costs capitalized	$ 400	$ 100	$ 751	$ 129